Kris, the Henry Johnsons in that group you posted are bad. Sorry.
If you compare the back stamp to the others in this thread (except Val's green one, which is different - and authentic, and super rare), you'll see that the "Henry Johnson" in yours is a non-serif typeface. "Henry Johnson" on the authentic ones is a serif typeface. My understanding is that yours came out of the 1970s.
-Al
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